What is CVE-2021-34866?

CVE-2021-34866 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10. CVE-2021-34866 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-34866?

CVE-2021-34866 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-34866?

No patch is currently available for CVE-2021-34866. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-34866 actively exploited?

CVE-2021-34866 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-34866

High

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel 5.14-rc3. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs, which can result in a type confusion condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel. Was ZDI-CAN-14689.

Package Linux Kernel

Published 2022-01-25

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-843

CVE-2021-34866 is classified as CWE-843

See CWE-843 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2021-34866 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Security
https://security.netapp.com/advisory/ntap-20220217-0008/

Third Party Advisory
Zerodayinitiative
https://www.zerodayinitiative.com/advisories/ZDI-21-1148/

Third Party Advisory VDB Entry

Details

CVE ID CVE-2021-34866

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2022-01-25

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-34866?

CVE-2021-34866 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . CVE-2021-34866 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-34866?

CVE-2021-34866 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-34866?

No patch is currently available for CVE-2021-34866. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-34866 actively exploited?

No — CVE-2021-34866 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.